Note 11 - Financial Assets and Liabilities Measured On a Non-recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015		Dec. 31, 2015		Dec. 31, 2014
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	$ 4,032				$ 4,032				$ 6,317
Impaired Loans [Member] | Commercial Portfolio Segment [Member]
Total at Fair Value	4,032				4,032				6,317
Total Losses			$ 2,574				$ 2,805		806		$ 17
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	18,843				18,843				20,359
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Total at Fair Value	18,843				18,843				20,359
Total Losses	945				945		654		598		3,914
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	13,436				13,436				13,009
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Total at Fair Value
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Total at Fair Value
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member]
Total at Fair Value	13,436				13,436				13,009
Total Losses							146		146		27
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	36,311				36,311				39,685
Impaired Loans [Member]
Total at Fair Value	36,311				36,311				39,685
Total Losses	945		2,574		945		3,605		1,550		3,958
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	440	[1]			440	[1]			4,235	[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]
Total at Fair Value		[1]				[1]				[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Total at Fair Value	7,995	[1]			7,995	[1]			10,047	[2]
Other Real Estate Owned [Member]
Total at Fair Value	8,435	[1]			8,435	[1]			14,282	[2]
Total Losses	88	[1]	44	[1]	216	[1]	225	[1]	404	[2]	202	[2]
Equity Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	4,499				4,499				4,922
Equity Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Total at Fair Value
Equity Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Total at Fair Value
Equity Investments [Member]
Total at Fair Value	4,499				4,499				4,922
Total Losses	122		103		231		327		553		436
Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	41,250				41,250				48,842
Fair Value, Inputs, Level 1 [Member]
Total at Fair Value
Fair Value, Inputs, Level 2 [Member]
Total at Fair Value	7,995				7,995				10,047
Total at Fair Value	49,245				49,245				58,889
Total Losses	$ 1,155		$ 2,721		$ 1,392		$ 4,157		$ 2,507		$ 4,596

[1] Other real estate owned balance of $26.4 million in the condensed consolidated balance sheet is net of estimated disposal costs.

[2] Other real estate owned balance of $24.7 million in the Consolidated Balance Sheets is net of estimated disposal costs